The root water uptake (RWU) rate of plants is influenced by various environmental factors. Low soil temperature stress can reduce RWU rate by inhibiting the growth of plant roots and increasing the hydraulic resistance of water transport among the soil‐plant‐atmosphere continuum. Given that low soil temperature stress is not accounted for in current land surface models (LSMs); in this study, we introduce three functions to represent low soil temperature stress, and modify the RWU scheme of the Common Land Model to quantify the role of low soil temperature stress on water and energy exchange between land and atmosphere. The simulated water and energy fluxes are evaluated using both in situ and global observational data sets. The results from in situ simulations show that ignoring effects of low soil temperature stress, latent, and sensible heat fluxes in spring are overestimated and underestimated, respectively, with the root mean square error up to 40 W/m². By incorporating the low soil temperature stress functions into the RWU scheme, nearly 40% of the simulated errors are reduced. The global simulated results also highlight the importance of accounting for low soil temperature stress on increasing the accuracy of the modeled latent heat flux over high latitude areas. While uncertainties from related physical processes and parameters warrant further investigations, our results indicate that consideration of low soil temperature stress significantly affects water and energy transport from land to atmosphere by restricting RWU rate, emphasizing the need to integrate it in LSMs to increase the model reliability, especially over cold regions.

中文翻译：

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在现场和全球离线试验中评估土壤温度低胁迫对土地表面能量通量模拟的影响

植物的根系吸水率受到各种环境因素的影响。较低的土壤温度胁迫可通过抑制植物根系的生长并增加土壤-植物-大气连续体之间水分传输的水力阻力来降低RWU率。鉴于目前的地表模型（LSM）并未考虑低土壤温度应力；在这项研究中，我们引入了代表低土壤温度应力的三个函数，并修改了“普通土地模型”的RWU方案，以量化低土壤温度应力对土地与大气之间的水和能量交换的作用。使用原位和全局观测数据集对模拟的水和能量通量进行评估。原位模拟的结果表明，忽略低土壤温度应力，潜在，²。通过将低土壤温度应力函数纳入RWU方案，可减少近40％的模拟误差。全局模拟结果还强调了解决低土壤温度应力对于提高高纬度地区模拟潜热通量准确性的重要性。尽管相关物理过程和参数的不确定性值得进一步研究，但我们的结果表明，通过限制RWU速率来考虑低土壤温度应力会显着影响水和能量从土地到大气的运输，强调需要将其集成到LSM中以提高模型的可靠性。 ，尤其是在寒冷地区。